Finding the Fourth Proportional to 1,288,189.62, 1,777,667.85 and 715,215.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288,189.62 : 1,777,667.85 = 715,215.06 : x
2. Step 2: Convert to fraction form
   1,288,189.62/1,777,667.85 = 715,215.06/x
3. Step 3: Cross multiply
   1,288,189.62x = 1,777,667.85 × 715,215.06
4. Step 4: Simplify right side
   1,288,189.62x = 1,271,414,817,997.82
5. Step 5: Solve for x
   x = 1,271,414,817,997.82/1,288,189.62
6. Step 6: Final answer
   x = 986,978.00