Finding the Fourth Proportional to 1,548.63, 2,320.83 and 715.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,548.63 : 2,320.83 = 715.20 : x
2. Step 2: Convert to fraction form
   1,548.63/2,320.83 = 715.20/x
3. Step 3: Cross multiply
   1,548.63x = 2,320.83 × 715.20
4. Step 4: Simplify right side
   1,548.63x = 1,659,857.62
5. Step 5: Solve for x
   x = 1,659,857.62/1,548.63
6. Step 6: Final answer
   x = 1,071.82