Finding the Fourth Proportional to 389,116.50, 536,980.77 and 210,268.50

Step by Step Solution

1. Step 1: Write the proportion equation
   389,116.50 : 536,980.77 = 210,268.50 : x
2. Step 2: Convert to fraction form
   389,116.50/536,980.77 = 210,268.50/x
3. Step 3: Cross multiply
   389,116.50x = 536,980.77 × 210,268.50
4. Step 4: Simplify right side
   389,116.50x = 112,910,141,036.75
5. Step 5: Solve for x
   x = 112,910,141,036.75/389,116.50
6. Step 6: Final answer
   x = 290,170.53