Finding the Fourth Proportional to 12,911.64, 19,366.98 and 7,104.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,911.64 : 19,366.98 = 7,104.72 : x
2. Step 2: Convert to fraction form
   12,911.64/19,366.98 = 7,104.72/x
3. Step 3: Cross multiply
   12,911.64x = 19,366.98 × 7,104.72
4. Step 4: Simplify right side
   12,911.64x = 137,596,970.15
5. Step 5: Solve for x
   x = 137,596,970.15/12,911.64
6. Step 6: Final answer
   x = 10,656.82