Finding the Fourth Proportional to 2,978.17, 4,112.48 and 1,861.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.17 : 4,112.48 = 1,861.01 : x
2. Step 2: Convert to fraction form
   2,978.17/4,112.48 = 1,861.01/x
3. Step 3: Cross multiply
   2,978.17x = 4,112.48 × 1,861.01
4. Step 4: Simplify right side
   2,978.17x = 7,653,381.34
5. Step 5: Solve for x
   x = 7,653,381.34/2,978.17
6. Step 6: Final answer
   x = 2,569.83