Finding the Fourth Proportional to 1,875.96, 2,813.72 and 780.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,875.96 : 2,813.72 = 780.04 : x
2. Step 2: Convert to fraction form
   1,875.96/2,813.72 = 780.04/x
3. Step 3: Cross multiply
   1,875.96x = 2,813.72 × 780.04
4. Step 4: Simplify right side
   1,875.96x = 2,194,814.15
5. Step 5: Solve for x
   x = 2,194,814.15/1,875.96
6. Step 6: Final answer
   x = 1,169.97