Finding the Fourth Proportional to 2,139,117.21, 2,951,502.71 and 1,221,053.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139,117.21 : 2,951,502.71 = 1,221,053.13 : x
2. Step 2: Convert to fraction form
   2,139,117.21/2,951,502.71 = 1,221,053.13/x
3. Step 3: Cross multiply
   2,139,117.21x = 2,951,502.71 × 1,221,053.13
4. Step 4: Simplify right side
   2,139,117.21x = 3,603,941,616,143.72
5. Step 5: Solve for x
   x = 3,603,941,616,143.72/2,139,117.21
6. Step 6: Final answer
   x = 1,684,779.87