Finding the Fourth Proportional to 1,777.72, 2,667.15 and 790.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,777.72 : 2,667.15 = 790.39 : x
2. Step 2: Convert to fraction form
   1,777.72/2,667.15 = 790.39/x
3. Step 3: Cross multiply
   1,777.72x = 2,667.15 × 790.39
4. Step 4: Simplify right side
   1,777.72x = 2,108,088.69
5. Step 5: Solve for x
   x = 2,108,088.69/1,777.72
6. Step 6: Final answer
   x = 1,185.84