Finding the Fourth Proportional to 1,390.58, 2,085.78 and 524.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.58 : 2,085.78 = 524.82 : x
2. Step 2: Convert to fraction form
   1,390.58/2,085.78 = 524.82/x
3. Step 3: Cross multiply
   1,390.58x = 2,085.78 × 524.82
4. Step 4: Simplify right side
   1,390.58x = 1,094,659.06
5. Step 5: Solve for x
   x = 1,094,659.06/1,390.58
6. Step 6: Final answer
   x = 787.20