Finding the Fourth Proportional to 139,847.10, 209,644.70 and 51,038.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,847.10 : 209,644.70 = 51,038.30 : x
2. Step 2: Convert to fraction form
   139,847.10/209,644.70 = 51,038.30/x
3. Step 3: Cross multiply
   139,847.10x = 209,644.70 × 51,038.30
4. Step 4: Simplify right side
   139,847.10x = 10,699,907,788.60
5. Step 5: Solve for x
   x = 10,699,907,788.60/139,847.10
6. Step 6: Final answer
   x = 76,511.47