Finding the Fourth Proportional to 139,416.99, 209,007.91 and 60,471.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,416.99 : 209,007.91 = 60,471.78 : x
2. Step 2: Convert to fraction form
   139,416.99/209,007.91 = 60,471.78/x
3. Step 3: Cross multiply
   139,416.99x = 209,007.91 × 60,471.78
4. Step 4: Simplify right side
   139,416.99x = 12,639,080,351.78
5. Step 5: Solve for x
   x = 12,639,080,351.78/139,416.99
6. Step 6: Final answer
   x = 90,656.67