Finding the Fourth Proportional to 43,123.46, 64,668.38 and 13,131.18

Step by Step Solution

1. Step 1: Write the proportion equation
   43,123.46 : 64,668.38 = 13,131.18 : x
2. Step 2: Convert to fraction form
   43,123.46/64,668.38 = 13,131.18/x
3. Step 3: Cross multiply
   43,123.46x = 64,668.38 × 13,131.18
4. Step 4: Simplify right side
   43,123.46x = 849,172,072.43
5. Step 5: Solve for x
   x = 849,172,072.43/43,123.46
6. Step 6: Final answer
   x = 19,691.65