Finding the Fourth Proportional to 1,112.31, 1,535.03 and 670.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.31 : 1,535.03 = 670.20 : x
2. Step 2: Convert to fraction form
   1,112.31/1,535.03 = 670.20/x
3. Step 3: Cross multiply
   1,112.31x = 1,535.03 × 670.20
4. Step 4: Simplify right side
   1,112.31x = 1,028,773.76
5. Step 5: Solve for x
   x = 1,028,773.76/1,112.31
6. Step 6: Final answer
   x = 924.90