Finding the Fourth Proportional to 93.32, 128.59 and 72.58

Step by Step Solution

1. Step 1: Write the proportion equation
   93.32 : 128.59 = 72.58 : x
2. Step 2: Convert to fraction form
   93.32/128.59 = 72.58/x
3. Step 3: Cross multiply
   93.32x = 128.59 × 72.58
4. Step 4: Simplify right side
   93.32x = 9,332.56
5. Step 5: Solve for x
   x = 9,332.56/93.32
6. Step 6: Final answer
   x = 100.00