Finding the Fourth Proportional to 13,013.60, 19,491.24 and 7,808.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,013.60 : 19,491.24 = 7,808.72 : x
2. Step 2: Convert to fraction form
   13,013.60/19,491.24 = 7,808.72/x
3. Step 3: Cross multiply
   13,013.60x = 19,491.24 × 7,808.72
4. Step 4: Simplify right side
   13,013.60x = 152,201,635.61
5. Step 5: Solve for x
   x = 152,201,635.61/13,013.60
6. Step 6: Final answer
   x = 11,695.58