Finding the Fourth Proportional to 152,748, 210,792.96 and 85,680

Step by Step Solution

1. Step 1: Write the proportion equation
   152,748 : 210,792.96 = 85,680 : x
2. Step 2: Convert to fraction form
   152,748/210,792.96 = 85,680/x
3. Step 3: Cross multiply
   152,748x = 210,792.96 × 85,680
4. Step 4: Simplify right side
   152,748x = 18,060,740,812.80
5. Step 5: Solve for x
   x = 18,060,740,812.80/152,748
6. Step 6: Final answer
   x = 118,238.80