Finding the Fourth Proportional to 72.99, 100.71 and 61.30

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 100.71 = 61.30 : x
2. Step 2: Convert to fraction form
   72.99/100.71 = 61.30/x
3. Step 3: Cross multiply
   72.99x = 100.71 × 61.30
4. Step 4: Simplify right side
   72.99x = 6,173.52
5. Step 5: Solve for x
   x = 6,173.52/72.99
6. Step 6: Final answer
   x = 84.58