Finding the Fourth Proportional to 426,733.51, 639,959.56 and 142,345.69

Step by Step Solution

1. Step 1: Write the proportion equation
   426,733.51 : 639,959.56 = 142,345.69 : x
2. Step 2: Convert to fraction form
   426,733.51/639,959.56 = 142,345.69/x
3. Step 3: Cross multiply
   426,733.51x = 639,959.56 × 142,345.69
4. Step 4: Simplify right side
   426,733.51x = 91,095,483,184.53
5. Step 5: Solve for x
   x = 91,095,483,184.53/426,733.51
6. Step 6: Final answer
   x = 213,471.60