Finding the Fourth Proportional to 139,920.06, 209,818.16 and 40,057.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,920.06 : 209,818.16 = 40,057.50 : x
2. Step 2: Convert to fraction form
   139,920.06/209,818.16 = 40,057.50/x
3. Step 3: Cross multiply
   139,920.06x = 209,818.16 × 40,057.50
4. Step 4: Simplify right side
   139,920.06x = 8,404,790,944.20
5. Step 5: Solve for x
   x = 8,404,790,944.20/139,920.06
6. Step 6: Final answer
   x = 60,068.52