Finding the Fourth Proportional to 2,978.84, 4,109.73 and 1,858.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.84 : 4,109.73 = 1,858.87 : x
2. Step 2: Convert to fraction form
   2,978.84/4,109.73 = 1,858.87/x
3. Step 3: Cross multiply
   2,978.84x = 4,109.73 × 1,858.87
4. Step 4: Simplify right side
   2,978.84x = 7,639,453.81
5. Step 5: Solve for x
   x = 7,639,453.81/2,978.84
6. Step 6: Final answer
   x = 2,564.57