Finding the Fourth Proportional to 2,158,078.51, 2,978,148.51 and 1,191,209.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158,078.51 : 2,978,148.51 = 1,191,209.05 : x
2. Step 2: Convert to fraction form
   2,158,078.51/2,978,148.51 = 1,191,209.05/x
3. Step 3: Cross multiply
   2,158,078.51x = 2,978,148.51 × 1,191,209.05
4. Step 4: Simplify right side
   2,158,078.51x = 3,547,597,457,356.02
5. Step 5: Solve for x
   x = 3,547,597,457,356.02/2,158,078.51
6. Step 6: Final answer
   x = 1,643,868.58