Finding the Fourth Proportional to 765,320.50, 1,056,152.00 and 421,196.05

Step by Step Solution

1. Step 1: Write the proportion equation
   765,320.50 : 1,056,152.00 = 421,196.05 : x
2. Step 2: Convert to fraction form
   765,320.50/1,056,152.00 = 421,196.05/x
3. Step 3: Cross multiply
   765,320.50x = 1,056,152.00 × 421,196.05
4. Step 4: Simplify right side
   765,320.50x = 444,847,049,012.21
5. Step 5: Solve for x
   x = 444,847,049,012.21/765,320.50
6. Step 6: Final answer
   x = 581,255.89