Finding the Fourth Proportional to 73.61, 100.69 and 73.31

Step by Step Solution

1. Step 1: Write the proportion equation
   73.61 : 100.69 = 73.31 : x
2. Step 2: Convert to fraction form
   73.61/100.69 = 73.31/x
3. Step 3: Cross multiply
   73.61x = 100.69 × 73.31
4. Step 4: Simplify right side
   73.61x = 7,381.31
5. Step 5: Solve for x
   x = 7,381.31/73.61
6. Step 6: Final answer
   x = 100.28