Finding the Fourth Proportional to 72.93, 100.58 and 56.57

Step by Step Solution

1. Step 1: Write the proportion equation
   72.93 : 100.58 = 56.57 : x
2. Step 2: Convert to fraction form
   72.93/100.58 = 56.57/x
3. Step 3: Cross multiply
   72.93x = 100.58 × 56.57
4. Step 4: Simplify right side
   72.93x = 5,689.02
5. Step 5: Solve for x
   x = 5,689.02/72.93
6. Step 6: Final answer
   x = 78.00