Finding the Fourth Proportional to 13,866.64, 19,134.34 and 7,815.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,866.64 : 19,134.34 = 7,815.72 : x
2. Step 2: Convert to fraction form
   13,866.64/19,134.34 = 7,815.72/x
3. Step 3: Cross multiply
   13,866.64x = 19,134.34 × 7,815.72
4. Step 4: Simplify right side
   13,866.64x = 149,548,643.82
5. Step 5: Solve for x
   x = 149,548,643.82/13,866.64
6. Step 6: Final answer
   x = 10,784.78