Finding the Fourth Proportional to 42,665.63, 63,999.36 and 13,082.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42,665.63 : 63,999.36 = 13,082.81 : x
2. Step 2: Convert to fraction form
   42,665.63/63,999.36 = 13,082.81/x
3. Step 3: Cross multiply
   42,665.63x = 63,999.36 × 13,082.81
4. Step 4: Simplify right side
   42,665.63x = 837,291,081.59
5. Step 5: Solve for x
   x = 837,291,081.59/42,665.63
6. Step 6: Final answer
   x = 19,624.49