Finding the Fourth Proportional to 124,128.45, 186,044.71 and 86,484.69

Step by Step Solution

1. Step 1: Write the proportion equation
   124,128.45 : 186,044.71 = 86,484.69 : x
2. Step 2: Convert to fraction form
   124,128.45/186,044.71 = 86,484.69/x
3. Step 3: Cross multiply
   124,128.45x = 186,044.71 × 86,484.69
4. Step 4: Simplify right side
   124,128.45x = 16,090,019,070.49
5. Step 5: Solve for x
   x = 16,090,019,070.49/124,128.45
6. Step 6: Final answer
   x = 129,623.94