Finding the Fourth Proportional to 1,077.69, 1,483.86 and 812.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.69 : 1,483.86 = 812.50 : x
2. Step 2: Convert to fraction form
   1,077.69/1,483.86 = 812.50/x
3. Step 3: Cross multiply
   1,077.69x = 1,483.86 × 812.50
4. Step 4: Simplify right side
   1,077.69x = 1,205,636.25
5. Step 5: Solve for x
   x = 1,205,636.25/1,077.69
6. Step 6: Final answer
   x = 1,118.72