Finding the Fourth Proportional to 91.79, 137.55 and 59.30

Step by Step Solution

1. Step 1: Write the proportion equation
   91.79 : 137.55 = 59.30 : x
2. Step 2: Convert to fraction form
   91.79/137.55 = 59.30/x
3. Step 3: Cross multiply
   91.79x = 137.55 × 59.30
4. Step 4: Simplify right side
   91.79x = 8,156.72
5. Step 5: Solve for x
   x = 8,156.72/91.79
6. Step 6: Final answer
   x = 88.86