Finding the Fourth Proportional to 1,346.77, 1,858.58 and 815.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,346.77 : 1,858.58 = 815.75 : x
2. Step 2: Convert to fraction form
   1,346.77/1,858.58 = 815.75/x
3. Step 3: Cross multiply
   1,346.77x = 1,858.58 × 815.75
4. Step 4: Simplify right side
   1,346.77x = 1,516,123.26
5. Step 5: Solve for x
   x = 1,516,123.26/1,346.77
6. Step 6: Final answer
   x = 1,125.75