Finding the Fourth Proportional to 99.10, 147.78 and 93.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99.10 : 147.78 = 93.42 : x
2. Step 2: Convert to fraction form
   99.10/147.78 = 93.42/x
3. Step 3: Cross multiply
   99.10x = 147.78 × 93.42
4. Step 4: Simplify right side
   99.10x = 13,805.61
5. Step 5: Solve for x
   x = 13,805.61/99.10
6. Step 6: Final answer
   x = 139.31