Finding the Fourth Proportional to 786,276, 1,085,061.60 and 428,580

Step by Step Solution

1. Step 1: Write the proportion equation
   786,276 : 1,085,061.60 = 428,580 : x
2. Step 2: Convert to fraction form
   786,276/1,085,061.60 = 428,580/x
3. Step 3: Cross multiply
   786,276x = 1,085,061.60 × 428,580
4. Step 4: Simplify right side
   786,276x = 465,035,700,528.00
5. Step 5: Solve for x
   x = 465,035,700,528.00/786,276
6. Step 6: Final answer
   x = 591,440.79