Finding the Fourth Proportional to 389,111.12, 536,973.72 and 210,263.12

Step by Step Solution

1. Step 1: Write the proportion equation
   389,111.12 : 536,973.72 = 210,263.12 : x
2. Step 2: Convert to fraction form
   389,111.12/536,973.72 = 210,263.12/x
3. Step 3: Cross multiply
   389,111.12x = 536,973.72 × 210,263.12
4. Step 4: Simplify right side
   389,111.12x = 112,905,769,725.21
5. Step 5: Solve for x
   x = 112,905,769,725.21/389,111.12
6. Step 6: Final answer
   x = 290,163.31