Finding the Fourth Proportional to 1,340,061.39, 2,010,139.29 and 429,271.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340,061.39 : 2,010,139.29 = 429,271.56 : x
2. Step 2: Convert to fraction form
   1,340,061.39/2,010,139.29 = 429,271.56/x
3. Step 3: Cross multiply
   1,340,061.39x = 2,010,139.29 × 429,271.56
4. Step 4: Simplify right side
   1,340,061.39x = 862,895,628,835.59
5. Step 5: Solve for x
   x = 862,895,628,835.59/1,340,061.39
6. Step 6: Final answer
   x = 643,922.46