Finding the Fourth Proportional to 11,807.98, 17,707.84 and 3,485.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,807.98 : 17,707.84 = 3,485.78 : x
2. Step 2: Convert to fraction form
   11,807.98/17,707.84 = 3,485.78/x
3. Step 3: Cross multiply
   11,807.98x = 17,707.84 × 3,485.78
4. Step 4: Simplify right side
   11,807.98x = 61,725,634.52
5. Step 5: Solve for x
   x = 61,725,634.52/11,807.98
6. Step 6: Final answer
   x = 5,227.45