Finding the Fourth Proportional to 99.48, 148.98 and 78.12

Step by Step Solution

1. Step 1: Write the proportion equation
   99.48 : 148.98 = 78.12 : x
2. Step 2: Convert to fraction form
   99.48/148.98 = 78.12/x
3. Step 3: Cross multiply
   99.48x = 148.98 × 78.12
4. Step 4: Simplify right side
   99.48x = 11,638.32
5. Step 5: Solve for x
   x = 11,638.32/99.48
6. Step 6: Final answer
   x = 116.99