Finding the Fourth Proportional to 12,910.95, 19,317.51 and 7,648.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.95 : 19,317.51 = 7,648.78 : x
2. Step 2: Convert to fraction form
   12,910.95/19,317.51 = 7,648.78/x
3. Step 3: Cross multiply
   12,910.95x = 19,317.51 × 7,648.78
4. Step 4: Simplify right side
   12,910.95x = 147,755,384.14
5. Step 5: Solve for x
   x = 147,755,384.14/12,910.95
6. Step 6: Final answer
   x = 11,444.19