Finding the Fourth Proportional to 1,339.02, 1,848.15 and 815.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.02 : 1,848.15 = 815.40 : x
2. Step 2: Convert to fraction form
   1,339.02/1,848.15 = 815.40/x
3. Step 3: Cross multiply
   1,339.02x = 1,848.15 × 815.40
4. Step 4: Simplify right side
   1,339.02x = 1,506,981.51
5. Step 5: Solve for x
   x = 1,506,981.51/1,339.02
6. Step 6: Final answer
   x = 1,125.44