Finding the Fourth Proportional to 100.47, 137.71 and 99.10

Step by Step Solution

1. Step 1: Write the proportion equation
   100.47 : 137.71 = 99.10 : x
2. Step 2: Convert to fraction form
   100.47/137.71 = 99.10/x
3. Step 3: Cross multiply
   100.47x = 137.71 × 99.10
4. Step 4: Simplify right side
   100.47x = 13,647.11
5. Step 5: Solve for x
   x = 13,647.11/100.47
6. Step 6: Final answer
   x = 135.84