Finding the Fourth Proportional to 13,905.60, 19,188.96 and 7,616.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,905.60 : 19,188.96 = 7,616.72 : x
2. Step 2: Convert to fraction form
   13,905.60/19,188.96 = 7,616.72/x
3. Step 3: Cross multiply
   13,905.60x = 19,188.96 × 7,616.72
4. Step 4: Simplify right side
   13,905.60x = 146,156,935.41
5. Step 5: Solve for x
   x = 146,156,935.41/13,905.60
6. Step 6: Final answer
   x = 10,510.65