Finding the Fourth Proportional to 2,770.66, 4,156.38 and 921.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,770.66 : 4,156.38 = 921.98 : x
2. Step 2: Convert to fraction form
   2,770.66/4,156.38 = 921.98/x
3. Step 3: Cross multiply
   2,770.66x = 4,156.38 × 921.98
4. Step 4: Simplify right side
   2,770.66x = 3,832,099.23
5. Step 5: Solve for x
   x = 3,832,099.23/2,770.66
6. Step 6: Final answer
   x = 1,383.10