Finding the Fourth Proportional to 137,200.64, 204,969.58 and 86,877.78

Step by Step Solution

1. Step 1: Write the proportion equation
   137,200.64 : 204,969.58 = 86,877.78 : x
2. Step 2: Convert to fraction form
   137,200.64/204,969.58 = 86,877.78/x
3. Step 3: Cross multiply
   137,200.64x = 204,969.58 × 86,877.78
4. Step 4: Simplify right side
   137,200.64x = 17,807,302,077.93
5. Step 5: Solve for x
   x = 17,807,302,077.93/137,200.64
6. Step 6: Final answer
   x = 129,790.23