Finding the Fourth Proportional to 139,503.69, 209,189.91 and 97,431.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,503.69 : 209,189.91 = 97,431.28 : x
2. Step 2: Convert to fraction form
   139,503.69/209,189.91 = 97,431.28/x
3. Step 3: Cross multiply
   139,503.69x = 209,189.91 × 97,431.28
4. Step 4: Simplify right side
   139,503.69x = 20,381,639,404.86
5. Step 5: Solve for x
   x = 20,381,639,404.86/139,503.69
6. Step 6: Final answer
   x = 146,101.08