Finding the Fourth Proportional to 91,097.20, 136,645.20 and 42,405.52

Step by Step Solution

1. Step 1: Write the proportion equation
   91,097.20 : 136,645.20 = 42,405.52 : x
2. Step 2: Convert to fraction form
   91,097.20/136,645.20 = 42,405.52/x
3. Step 3: Cross multiply
   91,097.20x = 136,645.20 × 42,405.52
4. Step 4: Simplify right side
   91,097.20x = 5,794,510,761.50
5. Step 5: Solve for x
   x = 5,794,510,761.50/91,097.20
6. Step 6: Final answer
   x = 63,608.00