Finding the Fourth Proportional to 389,105.51, 536,973.71 and 219,339.63

Step by Step Solution

1. Step 1: Write the proportion equation
   389,105.51 : 536,973.71 = 219,339.63 : x
2. Step 2: Convert to fraction form
   389,105.51/536,973.71 = 219,339.63/x
3. Step 3: Cross multiply
   389,105.51x = 536,973.71 × 219,339.63
4. Step 4: Simplify right side
   389,105.51x = 117,779,613,774.43
5. Step 5: Solve for x
   x = 117,779,613,774.43/389,105.51
6. Step 6: Final answer
   x = 302,693.26