Finding the Fourth Proportional to 139,894.32, 209,763.72 and 56,691.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,894.32 : 209,763.72 = 56,691.12 : x
2. Step 2: Convert to fraction form
   139,894.32/209,763.72 = 56,691.12/x
3. Step 3: Cross multiply
   139,894.32x = 209,763.72 × 56,691.12
4. Step 4: Simplify right side
   139,894.32x = 11,891,740,222.17
5. Step 5: Solve for x
   x = 11,891,740,222.17/139,894.32
6. Step 6: Final answer
   x = 85,005.17