Finding the Fourth Proportional to 1,347.28, 1,858.81 and 815.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,347.28 : 1,858.81 = 815.99 : x
2. Step 2: Convert to fraction form
   1,347.28/1,858.81 = 815.99/x
3. Step 3: Cross multiply
   1,347.28x = 1,858.81 × 815.99
4. Step 4: Simplify right side
   1,347.28x = 1,516,771.02
5. Step 5: Solve for x
   x = 1,516,771.02/1,347.28
6. Step 6: Final answer
   x = 1,125.80