Finding the Fourth Proportional to 139,126.16, 208,641.72 and 45,610.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,126.16 : 208,641.72 = 45,610.40 : x
2. Step 2: Convert to fraction form
   139,126.16/208,641.72 = 45,610.40/x
3. Step 3: Cross multiply
   139,126.16x = 208,641.72 × 45,610.40
4. Step 4: Simplify right side
   139,126.16x = 9,516,232,305.89
5. Step 5: Solve for x
   x = 9,516,232,305.89/139,126.16
6. Step 6: Final answer
   x = 68,400.02