Finding the Fourth Proportional to 99,066.72, 136,697.56 and 56,617.05

Step by Step Solution

1. Step 1: Write the proportion equation
   99,066.72 : 136,697.56 = 56,617.05 : x
2. Step 2: Convert to fraction form
   99,066.72/136,697.56 = 56,617.05/x
3. Step 3: Cross multiply
   99,066.72x = 136,697.56 × 56,617.05
4. Step 4: Simplify right side
   99,066.72x = 7,739,412,589.40
5. Step 5: Solve for x
   x = 7,739,412,589.40/99,066.72
6. Step 6: Final answer
   x = 78,123.23