Finding the Fourth Proportional to 125,665, 173,417.70 and 71,967.78

Step by Step Solution

1. Step 1: Write the proportion equation
   125,665 : 173,417.70 = 71,967.78 : x
2. Step 2: Convert to fraction form
   125,665/173,417.70 = 71,967.78/x
3. Step 3: Cross multiply
   125,665x = 173,417.70 × 71,967.78
4. Step 4: Simplify right side
   125,665x = 12,480,486,881.71
5. Step 5: Solve for x
   x = 12,480,486,881.71/125,665
6. Step 6: Final answer
   x = 99,315.54