Finding the Fourth Proportional to 10,345.77, 15,510.96 and 5,155.29

Step by Step Solution

1. Step 1: Write the proportion equation
   10,345.77 : 15,510.96 = 5,155.29 : x
2. Step 2: Convert to fraction form
   10,345.77/15,510.96 = 5,155.29/x
3. Step 3: Cross multiply
   10,345.77x = 15,510.96 × 5,155.29
4. Step 4: Simplify right side
   10,345.77x = 79,963,496.98
5. Step 5: Solve for x
   x = 79,963,496.98/10,345.77
6. Step 6: Final answer
   x = 7,729.10