Finding the Fourth Proportional to 1,328,538.10, 1,993,123.34 and 429,979.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328,538.10 : 1,993,123.34 = 429,979.84 : x
2. Step 2: Convert to fraction form
   1,328,538.10/1,993,123.34 = 429,979.84/x
3. Step 3: Cross multiply
   1,328,538.10x = 1,993,123.34 × 429,979.84
4. Step 4: Simplify right side
   1,328,538.10x = 857,002,854,833.47
5. Step 5: Solve for x
   x = 857,002,854,833.47/1,328,538.10
6. Step 6: Final answer
   x = 645,072.09