Finding the Fourth Proportional to 1,347.47, 1,858.51 and 1,015.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,347.47 : 1,858.51 = 1,015.91 : x
2. Step 2: Convert to fraction form
   1,347.47/1,858.51 = 1,015.91/x
3. Step 3: Cross multiply
   1,347.47x = 1,858.51 × 1,015.91
4. Step 4: Simplify right side
   1,347.47x = 1,888,078.89
5. Step 5: Solve for x
   x = 1,888,078.89/1,347.47
6. Step 6: Final answer
   x = 1,401.20