Finding the Fourth Proportional to 1,113.15, 1,535.53 and 670.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.15 : 1,535.53 = 670.78 : x
2. Step 2: Convert to fraction form
   1,113.15/1,535.53 = 670.78/x
3. Step 3: Cross multiply
   1,113.15x = 1,535.53 × 670.78
4. Step 4: Simplify right side
   1,113.15x = 1,030,002.81
5. Step 5: Solve for x
   x = 1,030,002.81/1,113.15
6. Step 6: Final answer
   x = 925.30