Finding the Fourth Proportional to 139,086.79, 208,538.01 and 50,328.74

Step by Step Solution

1. Step 1: Write the proportion equation
   139,086.79 : 208,538.01 = 50,328.74 : x
2. Step 2: Convert to fraction form
   139,086.79/208,538.01 = 50,328.74/x
3. Step 3: Cross multiply
   139,086.79x = 208,538.01 × 50,328.74
4. Step 4: Simplify right side
   139,086.79x = 10,495,455,806.75
5. Step 5: Solve for x
   x = 10,495,455,806.75/139,086.79
6. Step 6: Final answer
   x = 75,459.76