Finding the Fourth Proportional to 338,499.61, 507,748.48 and 85,779.37

Step by Step Solution

1. Step 1: Write the proportion equation
   338,499.61 : 507,748.48 = 85,779.37 : x
2. Step 2: Convert to fraction form
   338,499.61/507,748.48 = 85,779.37/x
3. Step 3: Cross multiply
   338,499.61x = 507,748.48 × 85,779.37
4. Step 4: Simplify right side
   338,499.61x = 43,554,344,732.86
5. Step 5: Solve for x
   x = 43,554,344,732.86/338,499.61
6. Step 6: Final answer
   x = 128,668.82