Finding the Fourth Proportional to 89,385.34, 123,338.40 and 51,138.81

Step by Step Solution

1. Step 1: Write the proportion equation
   89,385.34 : 123,338.40 = 51,138.81 : x
2. Step 2: Convert to fraction form
   89,385.34/123,338.40 = 51,138.81/x
3. Step 3: Cross multiply
   89,385.34x = 123,338.40 × 51,138.81
4. Step 4: Simplify right side
   89,385.34x = 6,307,379,003.30
5. Step 5: Solve for x
   x = 6,307,379,003.30/89,385.34
6. Step 6: Final answer
   x = 70,563.91