Finding the Fourth Proportional to 99.72, 137.42 and 70.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 137.42 = 70.52 : x
2. Step 2: Convert to fraction form
   99.72/137.42 = 70.52/x
3. Step 3: Cross multiply
   99.72x = 137.42 × 70.52
4. Step 4: Simplify right side
   99.72x = 9,690.86
5. Step 5: Solve for x
   x = 9,690.86/99.72
6. Step 6: Final answer
   x = 97.18