Finding the Fourth Proportional to 200,978.52, 277,293.54 and 129,400.02

Step by Step Solution

1. Step 1: Write the proportion equation
   200,978.52 : 277,293.54 = 129,400.02 : x
2. Step 2: Convert to fraction form
   200,978.52/277,293.54 = 129,400.02/x
3. Step 3: Cross multiply
   200,978.52x = 277,293.54 × 129,400.02
4. Step 4: Simplify right side
   200,978.52x = 35,881,789,621.87
5. Step 5: Solve for x
   x = 35,881,789,621.87/200,978.52
6. Step 6: Final answer
   x = 178,535.45