Finding the Fourth Proportional to 99.60, 137.34 and 74.74

Step by Step Solution

1. Step 1: Write the proportion equation
   99.60 : 137.34 = 74.74 : x
2. Step 2: Convert to fraction form
   99.60/137.34 = 74.74/x
3. Step 3: Cross multiply
   99.60x = 137.34 × 74.74
4. Step 4: Simplify right side
   99.60x = 10,264.50
5. Step 5: Solve for x
   x = 10,264.50/99.60
6. Step 6: Final answer
   x = 103.05