Finding the Fourth Proportional to 85,737.47, 128,084.69 and 55,505.42

Step by Step Solution

1. Step 1: Write the proportion equation
   85,737.47 : 128,084.69 = 55,505.42 : x
2. Step 2: Convert to fraction form
   85,737.47/128,084.69 = 55,505.42/x
3. Step 3: Cross multiply
   85,737.47x = 128,084.69 × 55,505.42
4. Step 4: Simplify right side
   85,737.47x = 7,109,393,596.07
5. Step 5: Solve for x
   x = 7,109,393,596.07/85,737.47
6. Step 6: Final answer
   x = 82,920.49