Finding the Fourth Proportional to 13,031.35, 19,573.17 and 7,776.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,031.35 : 19,573.17 = 7,776.61 : x
2. Step 2: Convert to fraction form
   13,031.35/19,573.17 = 7,776.61/x
3. Step 3: Cross multiply
   13,031.35x = 19,573.17 × 7,776.61
4. Step 4: Simplify right side
   13,031.35x = 152,212,909.55
5. Step 5: Solve for x
   x = 152,212,909.55/13,031.35
6. Step 6: Final answer
   x = 11,680.52