Finding the Fourth Proportional to 152.63, 228.59 and 91.59

Step by Step Solution

1. Step 1: Write the proportion equation
   152.63 : 228.59 = 91.59 : x
2. Step 2: Convert to fraction form
   152.63/228.59 = 91.59/x
3. Step 3: Cross multiply
   152.63x = 228.59 × 91.59
4. Step 4: Simplify right side
   152.63x = 20,936.56
5. Step 5: Solve for x
   x = 20,936.56/152.63
6. Step 6: Final answer
   x = 137.17