Finding the Fourth Proportional to 99,456.34, 137,215.14 and 56,430.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,456.34 : 137,215.14 = 56,430.76 : x
2. Step 2: Convert to fraction form
   99,456.34/137,215.14 = 56,430.76/x
3. Step 3: Cross multiply
   99,456.34x = 137,215.14 × 56,430.76
4. Step 4: Simplify right side
   99,456.34x = 7,743,154,633.71
5. Step 5: Solve for x
   x = 7,743,154,633.71/99,456.34
6. Step 6: Final answer
   x = 77,854.81