Finding the Fourth Proportional to 257,483.34, 386,225.15 and 79,990.47

Step by Step Solution

1. Step 1: Write the proportion equation
   257,483.34 : 386,225.15 = 79,990.47 : x
2. Step 2: Convert to fraction form
   257,483.34/386,225.15 = 79,990.47/x
3. Step 3: Cross multiply
   257,483.34x = 386,225.15 × 79,990.47
4. Step 4: Simplify right side
   257,483.34x = 30,894,330,874.37
5. Step 5: Solve for x
   x = 30,894,330,874.37/257,483.34
6. Step 6: Final answer
   x = 119,985.75