Finding the Fourth Proportional to 139,898.32, 209,769.72 and 56,695.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,898.32 : 209,769.72 = 56,695.12 : x
2. Step 2: Convert to fraction form
   139,898.32/209,769.72 = 56,695.12/x
3. Step 3: Cross multiply
   139,898.32x = 209,769.72 × 56,695.12
4. Step 4: Simplify right side
   139,898.32x = 11,892,919,447.77
5. Step 5: Solve for x
   x = 11,892,919,447.77/139,898.32
6. Step 6: Final answer
   x = 85,011.17