Finding the Fourth Proportional to 13,123.72, 19,681.31 and 4,356.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.72 : 19,681.31 = 4,356.28 : x
2. Step 2: Convert to fraction form
   13,123.72/19,681.31 = 4,356.28/x
3. Step 3: Cross multiply
   13,123.72x = 19,681.31 × 4,356.28
4. Step 4: Simplify right side
   13,123.72x = 85,737,332.62
5. Step 5: Solve for x
   x = 85,737,332.62/13,123.72
6. Step 6: Final answer
   x = 6,533.00