Finding the Fourth Proportional to 1,129,819.50, 1,558,771.61 and 639,722.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,129,819.50 : 1,558,771.61 = 639,722.12 : x
2. Step 2: Convert to fraction form
   1,129,819.50/1,558,771.61 = 639,722.12/x
3. Step 3: Cross multiply
   1,129,819.50x = 1,558,771.61 × 639,722.12
4. Step 4: Simplify right side
   1,129,819.50x = 997,180,667,952.55
5. Step 5: Solve for x
   x = 997,180,667,952.55/1,129,819.50
6. Step 6: Final answer
   x = 882,601.75