Finding the Fourth Proportional to 257,325,320.42, 355,111,685.33 and 139,850,656.73

Step by Step Solution

1. Step 1: Write the proportion equation
   257,325,320.42 : 355,111,685.33 = 139,850,656.73 : x
2. Step 2: Convert to fraction form
   257,325,320.42/355,111,685.33 = 139,850,656.73/x
3. Step 3: Cross multiply
   257,325,320.42x = 355,111,685.33 × 139,850,656.73
4. Step 4: Simplify right side
   257,325,320.42x = 49,662,602,403,422,792
5. Step 5: Solve for x
   x = 49,662,602,403,422,792/257,325,320.42
6. Step 6: Final answer
   x = 192,995,397.12