Finding the Fourth Proportional to 100.52, 151.05 and 69.87

Step by Step Solution

1. Step 1: Write the proportion equation
   100.52 : 151.05 = 69.87 : x
2. Step 2: Convert to fraction form
   100.52/151.05 = 69.87/x
3. Step 3: Cross multiply
   100.52x = 151.05 × 69.87
4. Step 4: Simplify right side
   100.52x = 10,553.86
5. Step 5: Solve for x
   x = 10,553.86/100.52
6. Step 6: Final answer
   x = 105.00