Finding the Fourth Proportional to 385,978.56, 532,670.94 and 213,915.35

Step by Step Solution

1. Step 1: Write the proportion equation
   385,978.56 : 532,670.94 = 213,915.35 : x
2. Step 2: Convert to fraction form
   385,978.56/532,670.94 = 213,915.35/x
3. Step 3: Cross multiply
   385,978.56x = 532,670.94 × 213,915.35
4. Step 4: Simplify right side
   385,978.56x = 113,946,490,564.93
5. Step 5: Solve for x
   x = 113,946,490,564.93/385,978.56
6. Step 6: Final answer
   x = 295,214.56