Finding the Fourth Proportional to 60,128.32, 90,093.52 and 20,663.84

Step by Step Solution

1. Step 1: Write the proportion equation
   60,128.32 : 90,093.52 = 20,663.84 : x
2. Step 2: Convert to fraction form
   60,128.32/90,093.52 = 20,663.84/x
3. Step 3: Cross multiply
   60,128.32x = 90,093.52 × 20,663.84
4. Step 4: Simplify right side
   60,128.32x = 1,861,678,082.32
5. Step 5: Solve for x
   x = 1,861,678,082.32/60,128.32
6. Step 6: Final answer
   x = 30,961.75