Finding the Fourth Proportional to 12,801.32, 19,204.60 and 5,405.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,801.32 : 19,204.60 = 5,405.78 : x
2. Step 2: Convert to fraction form
   12,801.32/19,204.60 = 5,405.78/x
3. Step 3: Cross multiply
   12,801.32x = 19,204.60 × 5,405.78
4. Step 4: Simplify right side
   12,801.32x = 103,815,842.59
5. Step 5: Solve for x
   x = 103,815,842.59/12,801.32
6. Step 6: Final answer
   x = 8,109.78