Finding the Fourth Proportional to 99.56, 137.34 and 60.72

Step by Step Solution

1. Step 1: Write the proportion equation
   99.56 : 137.34 = 60.72 : x
2. Step 2: Convert to fraction form
   99.56/137.34 = 60.72/x
3. Step 3: Cross multiply
   99.56x = 137.34 × 60.72
4. Step 4: Simplify right side
   99.56x = 8,339.28
5. Step 5: Solve for x
   x = 8,339.28/99.56
6. Step 6: Final answer
   x = 83.77