Finding the Fourth Proportional to 139,922.32, 209,805.72 and 56,719.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,922.32 : 209,805.72 = 56,719.12 : x
2. Step 2: Convert to fraction form
   139,922.32/209,805.72 = 56,719.12/x
3. Step 3: Cross multiply
   139,922.32x = 209,805.72 × 56,719.12
4. Step 4: Simplify right side
   139,922.32x = 11,899,995,809.37
5. Step 5: Solve for x
   x = 11,899,995,809.37/139,922.32
6. Step 6: Final answer
   x = 85,047.16