Finding the Fourth Proportional to 12,748.30, 19,115.88 and 5,722.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,748.30 : 19,115.88 = 5,722.29 : x
2. Step 2: Convert to fraction form
   12,748.30/19,115.88 = 5,722.29/x
3. Step 3: Cross multiply
   12,748.30x = 19,115.88 × 5,722.29
4. Step 4: Simplify right side
   12,748.30x = 109,386,484.77
5. Step 5: Solve for x
   x = 109,386,484.77/12,748.30
6. Step 6: Final answer
   x = 8,580.48