Finding the Fourth Proportional to 99.91, 150.00 and 83.00

Step by Step Solution

1. Step 1: Write the proportion equation
   99.91 : 150.00 = 83.00 : x
2. Step 2: Convert to fraction form
   99.91/150.00 = 83.00/x
3. Step 3: Cross multiply
   99.91x = 150.00 × 83.00
4. Step 4: Simplify right side
   99.91x = 12,449.58
5. Step 5: Solve for x
   x = 12,449.58/99.91
6. Step 6: Final answer
   x = 124.60