Finding the Fourth Proportional to 686,300.96, 946,271.76 and 590,643.20

Step by Step Solution

1. Step 1: Write the proportion equation
   686,300.96 : 946,271.76 = 590,643.20 : x
2. Step 2: Convert to fraction form
   686,300.96/946,271.76 = 590,643.20/x
3. Step 3: Cross multiply
   686,300.96x = 946,271.76 × 590,643.20
4. Step 4: Simplify right side
   686,300.96x = 558,908,980,396.03
5. Step 5: Solve for x
   x = 558,908,980,396.03/686,300.96
6. Step 6: Final answer
   x = 814,378.84