Finding the Fourth Proportional to 139,416.58, 209,007.28 and 60,471.33

Step by Step Solution

1. Step 1: Write the proportion equation
   139,416.58 : 209,007.28 = 60,471.33 : x
2. Step 2: Convert to fraction form
   139,416.58/209,007.28 = 60,471.33/x
3. Step 3: Cross multiply
   139,416.58x = 209,007.28 × 60,471.33
4. Step 4: Simplify right side
   139,416.58x = 12,638,948,201.28
5. Step 5: Solve for x
   x = 12,638,948,201.28/139,416.58
6. Step 6: Final answer
   x = 90,655.99