Finding the Fourth Proportional to 99.32, 137.06 and 57.87

Step by Step Solution

1. Step 1: Write the proportion equation
   99.32 : 137.06 = 57.87 : x
2. Step 2: Convert to fraction form
   99.32/137.06 = 57.87/x
3. Step 3: Cross multiply
   99.32x = 137.06 × 57.87
4. Step 4: Simplify right side
   99.32x = 7,931.37
5. Step 5: Solve for x
   x = 7,931.37/99.32
6. Step 6: Final answer
   x = 79.86