Finding the Fourth Proportional to 78.32, 108.06 and 72.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78.32 : 108.06 = 72.50 : x
2. Step 2: Convert to fraction form
   78.32/108.06 = 72.50/x
3. Step 3: Cross multiply
   78.32x = 108.06 × 72.50
4. Step 4: Simplify right side
   78.32x = 7,834.35
5. Step 5: Solve for x
   x = 7,834.35/78.32
6. Step 6: Final answer
   x = 100.03