Finding the Fourth Proportional to 1,112.48, 1,535.54 and 780.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.48 : 1,535.54 = 780.98 : x
2. Step 2: Convert to fraction form
   1,112.48/1,535.54 = 780.98/x
3. Step 3: Cross multiply
   1,112.48x = 1,535.54 × 780.98
4. Step 4: Simplify right side
   1,112.48x = 1,199,225.96
5. Step 5: Solve for x
   x = 1,199,225.96/1,112.48
6. Step 6: Final answer
   x = 1,077.98