Finding the Fourth Proportional to 128,978.06, 177,981.04 and 71,614.43

Step by Step Solution

1. Step 1: Write the proportion equation
   128,978.06 : 177,981.04 = 71,614.43 : x
2. Step 2: Convert to fraction form
   128,978.06/177,981.04 = 71,614.43/x
3. Step 3: Cross multiply
   128,978.06x = 177,981.04 × 71,614.43
4. Step 4: Simplify right side
   128,978.06x = 12,746,010,730.41
5. Step 5: Solve for x
   x = 12,746,010,730.41/128,978.06
6. Step 6: Final answer
   x = 98,823.09