Finding the Fourth Proportional to 2,870.18, 4,305.86 and 923.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.18 : 4,305.86 = 923.74 : x
2. Step 2: Convert to fraction form
   2,870.18/4,305.86 = 923.74/x
3. Step 3: Cross multiply
   2,870.18x = 4,305.86 × 923.74
4. Step 4: Simplify right side
   2,870.18x = 3,977,495.12
5. Step 5: Solve for x
   x = 3,977,495.12/2,870.18
6. Step 6: Final answer
   x = 1,385.80