Finding the Fourth Proportional to 91,099.20, 136,648.20 and 42,407.52

Step by Step Solution

1. Step 1: Write the proportion equation
   91,099.20 : 136,648.20 = 42,407.52 : x
2. Step 2: Convert to fraction form
   91,099.20/136,648.20 = 42,407.52/x
3. Step 3: Cross multiply
   91,099.20x = 136,648.20 × 42,407.52
4. Step 4: Simplify right side
   91,099.20x = 5,794,911,274.46
5. Step 5: Solve for x
   x = 5,794,911,274.46/91,099.20
6. Step 6: Final answer
   x = 63,611.00