Finding the Fourth Proportional to 99.31, 137.00 and 61.93

Step by Step Solution

1. Step 1: Write the proportion equation
   99.31 : 137.00 = 61.93 : x
2. Step 2: Convert to fraction form
   99.31/137.00 = 61.93/x
3. Step 3: Cross multiply
   99.31x = 137.00 × 61.93
4. Step 4: Simplify right side
   99.31x = 8,484.10
5. Step 5: Solve for x
   x = 8,484.10/99.31
6. Step 6: Final answer
   x = 85.43