Finding the Fourth Proportional to 51,128.72, 76,702.76 and 19,962

Step by Step Solution

1. Step 1: Write the proportion equation
   51,128.72 : 76,702.76 = 19,962 : x
2. Step 2: Convert to fraction form
   51,128.72/76,702.76 = 19,962/x
3. Step 3: Cross multiply
   51,128.72x = 76,702.76 × 19,962
4. Step 4: Simplify right side
   51,128.72x = 1,531,140,495.12
5. Step 5: Solve for x
   x = 1,531,140,495.12/51,128.72
6. Step 6: Final answer
   x = 29,946.78