Finding the Fourth Proportional to 1,347.52, 1,858.78 and 1,015.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,347.52 : 1,858.78 = 1,015.80 : x
2. Step 2: Convert to fraction form
   1,347.52/1,858.78 = 1,015.80/x
3. Step 3: Cross multiply
   1,347.52x = 1,858.78 × 1,015.80
4. Step 4: Simplify right side
   1,347.52x = 1,888,148.72
5. Step 5: Solve for x
   x = 1,888,148.72/1,347.52
6. Step 6: Final answer
   x = 1,401.20