Finding the Fourth Proportional to 139,900.32, 209,772.72 and 56,697.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,900.32 : 209,772.72 = 56,697.12 : x
2. Step 2: Convert to fraction form
   139,900.32/209,772.72 = 56,697.12/x
3. Step 3: Cross multiply
   139,900.32x = 209,772.72 × 56,697.12
4. Step 4: Simplify right side
   139,900.32x = 11,893,509,078.57
5. Step 5: Solve for x
   x = 11,893,509,078.57/139,900.32
6. Step 6: Final answer
   x = 85,014.17