Finding the Fourth Proportional to 99.87, 149.72 and 58.69

Step by Step Solution

1. Step 1: Write the proportion equation
   99.87 : 149.72 = 58.69 : x
2. Step 2: Convert to fraction form
   99.87/149.72 = 58.69/x
3. Step 3: Cross multiply
   99.87x = 149.72 × 58.69
4. Step 4: Simplify right side
   99.87x = 8,786.96
5. Step 5: Solve for x
   x = 8,786.96/99.87
6. Step 6: Final answer
   x = 87.99