Finding the Fourth Proportional to 2,157,997.72, 2,978,037.12 and 1,191,128.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157,997.72 : 2,978,037.12 = 1,191,128.26 : x
2. Step 2: Convert to fraction form
   2,157,997.72/2,978,037.12 = 1,191,128.26/x
3. Step 3: Cross multiply
   2,157,997.72x = 2,978,037.12 × 1,191,128.26
4. Step 4: Simplify right side
   2,157,997.72x = 3,547,224,172,961.01
5. Step 5: Solve for x
   x = 3,547,224,172,961.01/2,157,997.72
6. Step 6: Final answer
   x = 1,643,757.15