Finding the Fourth Proportional to 389,347, 537,298.98 and 210,499

Step by Step Solution

1. Step 1: Write the proportion equation
   389,347 : 537,298.98 = 210,499 : x
2. Step 2: Convert to fraction form
   389,347/537,298.98 = 210,499/x
3. Step 3: Cross multiply
   389,347x = 537,298.98 × 210,499
4. Step 4: Simplify right side
   389,347x = 113,100,897,991.02
5. Step 5: Solve for x
   x = 113,100,897,991.02/389,347
6. Step 6: Final answer
   x = 290,488.68