Finding the Fourth Proportional to 1,007,675.02, 1,390,488.72 and 620,429.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007,675.02 : 1,390,488.72 = 620,429.02 : x
2. Step 2: Convert to fraction form
   1,007,675.02/1,390,488.72 = 620,429.02/x
3. Step 3: Cross multiply
   1,007,675.02x = 1,390,488.72 × 620,429.02
4. Step 4: Simplify right side
   1,007,675.02x = 862,699,553,870.65
5. Step 5: Solve for x
   x = 862,699,553,870.65/1,007,675.02
6. Step 6: Final answer
   x = 856,128.75