Finding the Fourth Proportional to 12,921.72, 19,384.61 and 5,526.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,921.72 : 19,384.61 = 5,526.22 : x
2. Step 2: Convert to fraction form
   12,921.72/19,384.61 = 5,526.22/x
3. Step 3: Cross multiply
   12,921.72x = 19,384.61 × 5,526.22
4. Step 4: Simplify right side
   12,921.72x = 107,123,619.47
5. Step 5: Solve for x
   x = 107,123,619.47/12,921.72
6. Step 6: Final answer
   x = 8,290.20