Finding the Fourth Proportional to 1,872.72, 2,808.05 and 777.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,872.72 : 2,808.05 = 777.83 : x
2. Step 2: Convert to fraction form
   1,872.72/2,808.05 = 777.83/x
3. Step 3: Cross multiply
   1,872.72x = 2,808.05 × 777.83
4. Step 4: Simplify right side
   1,872.72x = 2,184,167.60
5. Step 5: Solve for x
   x = 2,184,167.60/1,872.72
6. Step 6: Final answer
   x = 1,166.31