Finding the Fourth Proportional to 2,155.02, 2,972.76 and 1,779.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155.02 : 2,972.76 = 1,779.81 : x
2. Step 2: Convert to fraction form
   2,155.02/2,972.76 = 1,779.81/x
3. Step 3: Cross multiply
   2,155.02x = 2,972.76 × 1,779.81
4. Step 4: Simplify right side
   2,155.02x = 5,290,947.98
5. Step 5: Solve for x
   x = 5,290,947.98/2,155.02
6. Step 6: Final answer
   x = 2,455.17