Finding the Fourth Proportional to 2,158,077.51, 2,978,147.13 and 1,191,208.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158,077.51 : 2,978,147.13 = 1,191,208.05 : x
2. Step 2: Convert to fraction form
   2,158,077.51/2,978,147.13 = 1,191,208.05/x
3. Step 3: Cross multiply
   2,158,077.51x = 2,978,147.13 × 1,191,208.05
4. Step 4: Simplify right side
   2,158,077.51x = 3,547,592,835,340.40
5. Step 5: Solve for x
   x = 3,547,592,835,340.40/2,158,077.51
6. Step 6: Final answer
   x = 1,643,867.20