Finding the Fourth Proportional to 99,011.10, 136,642.56 and 56,568.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99,011.10 : 136,642.56 = 56,568.72 : x
2. Step 2: Convert to fraction form
   99,011.10/136,642.56 = 56,568.72/x
3. Step 3: Cross multiply
   99,011.10x = 136,642.56 × 56,568.72
4. Step 4: Simplify right side
   99,011.10x = 7,729,694,716.72
5. Step 5: Solve for x
   x = 7,729,694,716.72/99,011.10
6. Step 6: Final answer
   x = 78,068.97