Finding the Fourth Proportional to 1,425.82, 2,138.52 and 877.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.82 : 2,138.52 = 877.72 : x
2. Step 2: Convert to fraction form
   1,425.82/2,138.52 = 877.72/x
3. Step 3: Cross multiply
   1,425.82x = 2,138.52 × 877.72
4. Step 4: Simplify right side
   1,425.82x = 1,877,021.77
5. Step 5: Solve for x
   x = 1,877,021.77/1,425.82
6. Step 6: Final answer
   x = 1,316.45