Finding the Fourth Proportional to 706,564.17, 1,060,196.81 and 280,090.98

Step by Step Solution

1. Step 1: Write the proportion equation
   706,564.17 : 1,060,196.81 = 280,090.98 : x
2. Step 2: Convert to fraction form
   706,564.17/1,060,196.81 = 280,090.98/x
3. Step 3: Cross multiply
   706,564.17x = 1,060,196.81 × 280,090.98
4. Step 4: Simplify right side
   706,564.17x = 296,951,562,105.32
5. Step 5: Solve for x
   x = 296,951,562,105.32/706,564.17
6. Step 6: Final answer
   x = 420,275.43