Finding the Fourth Proportional to 13,868.49, 19,138.69 and 7,580.87

Step by Step Solution

1. Step 1: Write the proportion equation
   13,868.49 : 19,138.69 = 7,580.87 : x
2. Step 2: Convert to fraction form
   13,868.49/19,138.69 = 7,580.87/x
3. Step 3: Cross multiply
   13,868.49x = 19,138.69 × 7,580.87
4. Step 4: Simplify right side
   13,868.49x = 145,087,877.98
5. Step 5: Solve for x
   x = 145,087,877.98/13,868.49
6. Step 6: Final answer
   x = 10,461.69