Finding the Fourth Proportional to 1,113.08, 1,535.72 and 670.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.08 : 1,535.72 = 670.80 : x
2. Step 2: Convert to fraction form
   1,113.08/1,535.72 = 670.80/x
3. Step 3: Cross multiply
   1,113.08x = 1,535.72 × 670.80
4. Step 4: Simplify right side
   1,113.08x = 1,030,160.98
5. Step 5: Solve for x
   x = 1,030,160.98/1,113.08
6. Step 6: Final answer
   x = 925.50