Finding the Fourth Proportional to 12,900.83, 17,803.28 and 7,235.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.83 : 17,803.28 = 7,235.78 : x
2. Step 2: Convert to fraction form
   12,900.83/17,803.28 = 7,235.78/x
3. Step 3: Cross multiply
   12,900.83x = 17,803.28 × 7,235.78
4. Step 4: Simplify right side
   12,900.83x = 128,820,581.18
5. Step 5: Solve for x
   x = 128,820,581.18/12,900.83
6. Step 6: Final answer
   x = 9,985.45