Finding the Fourth Proportional to 13,155.32, 19,733.25 and 4,390.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,155.32 : 19,733.25 = 4,390.31 : x
2. Step 2: Convert to fraction form
   13,155.32/19,733.25 = 4,390.31/x
3. Step 3: Cross multiply
   13,155.32x = 19,733.25 × 4,390.31
4. Step 4: Simplify right side
   13,155.32x = 86,635,084.81
5. Step 5: Solve for x
   x = 86,635,084.81/13,155.32
6. Step 6: Final answer
   x = 6,585.56