Finding the Fourth Proportional to 129,519, 178,736.76 and 72,931.32

Step by Step Solution

1. Step 1: Write the proportion equation
   129,519 : 178,736.76 = 72,931.32 : x
2. Step 2: Convert to fraction form
   129,519/178,736.76 = 72,931.32/x
3. Step 3: Cross multiply
   129,519x = 178,736.76 × 72,931.32
4. Step 4: Simplify right side
   129,519x = 13,035,507,839.32
5. Step 5: Solve for x
   x = 13,035,507,839.32/129,519
6. Step 6: Final answer
   x = 100,645.53