Finding the Fourth Proportional to 1,388,527.49, 2,082,990.42 and 429,066.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,527.49 : 2,082,990.42 = 429,066.83 : x
2. Step 2: Convert to fraction form
   1,388,527.49/2,082,990.42 = 429,066.83/x
3. Step 3: Cross multiply
   1,388,527.49x = 2,082,990.42 × 429,066.83
4. Step 4: Simplify right side
   1,388,527.49x = 893,742,086,014.82
5. Step 5: Solve for x
   x = 893,742,086,014.82/1,388,527.49
6. Step 6: Final answer
   x = 643,661.79