Finding the Fourth Proportional to 2,115,089.72, 2,918,515.82 and 1,209,496.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115,089.72 : 2,918,515.82 = 1,209,496.76 : x
2. Step 2: Convert to fraction form
   2,115,089.72/2,918,515.82 = 1,209,496.76/x
3. Step 3: Cross multiply
   2,115,089.72x = 2,918,515.82 × 1,209,496.76
4. Step 4: Simplify right side
   2,115,089.72x = 3,529,935,428,298.74
5. Step 5: Solve for x
   x = 3,529,935,428,298.74/2,115,089.72
6. Step 6: Final answer
   x = 1,668,929.41