Finding the Fourth Proportional to 72,417.89, 99,877.50 and 50,978.67

Step by Step Solution

1. Step 1: Write the proportion equation
   72,417.89 : 99,877.50 = 50,978.67 : x
2. Step 2: Convert to fraction form
   72,417.89/99,877.50 = 50,978.67/x
3. Step 3: Cross multiply
   72,417.89x = 99,877.50 × 50,978.67
4. Step 4: Simplify right side
   72,417.89x = 5,091,622,112.93
5. Step 5: Solve for x
   x = 5,091,622,112.93/72,417.89
6. Step 6: Final answer
   x = 70,308.90