Finding the Fourth Proportional to 137,083.60, 205,056.72 and 128,685.52

Step by Step Solution

1. Step 1: Write the proportion equation
   137,083.60 : 205,056.72 = 128,685.52 : x
2. Step 2: Convert to fraction form
   137,083.60/205,056.72 = 128,685.52/x
3. Step 3: Cross multiply
   137,083.60x = 205,056.72 × 128,685.52
4. Step 4: Simplify right side
   137,083.60x = 26,387,830,642.69
5. Step 5: Solve for x
   x = 26,387,830,642.69/137,083.60
6. Step 6: Final answer
   x = 192,494.44