Finding the Fourth Proportional to 152,186.90, 228,280.37 and 85,674.78

Step by Step Solution

1. Step 1: Write the proportion equation
   152,186.90 : 228,280.37 = 85,674.78 : x
2. Step 2: Convert to fraction form
   152,186.90/228,280.37 = 85,674.78/x
3. Step 3: Cross multiply
   152,186.90x = 228,280.37 × 85,674.78
4. Step 4: Simplify right side
   152,186.90x = 19,557,870,049.69
5. Step 5: Solve for x
   x = 19,557,870,049.69/152,186.90
6. Step 6: Final answer
   x = 128,512.18