Finding the Fourth Proportional to 139,446.56, 209,195.76 and 56,398.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,446.56 : 209,195.76 = 56,398.88 : x
2. Step 2: Convert to fraction form
   139,446.56/209,195.76 = 56,398.88/x
3. Step 3: Cross multiply
   139,446.56x = 209,195.76 × 56,398.88
4. Step 4: Simplify right side
   139,446.56x = 11,798,406,564.75
5. Step 5: Solve for x
   x = 11,798,406,564.75/139,446.56
6. Step 6: Final answer
   x = 84,608.80