Finding the Fourth Proportional to 42,663.50, 64,007.53 and 13,085.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,663.50 : 64,007.53 = 13,085.67 : x
2. Step 2: Convert to fraction form
   42,663.50/64,007.53 = 13,085.67/x
3. Step 3: Cross multiply
   42,663.50x = 64,007.53 × 13,085.67
4. Step 4: Simplify right side
   42,663.50x = 837,581,382.38
5. Step 5: Solve for x
   x = 837,581,382.38/42,663.50
6. Step 6: Final answer
   x = 19,632.27