Finding the Fourth Proportional to 1,060,215.35, 1,590,315.59 and 429,120.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,060,215.35 : 1,590,315.59 = 429,120.05 : x
2. Step 2: Convert to fraction form
   1,060,215.35/1,590,315.59 = 429,120.05/x
3. Step 3: Cross multiply
   1,060,215.35x = 1,590,315.59 × 429,120.05
4. Step 4: Simplify right side
   1,060,215.35x = 682,436,298,617.80
5. Step 5: Solve for x
   x = 682,436,298,617.80/1,060,215.35
6. Step 6: Final answer
   x = 643,677.06