Finding the Fourth Proportional to 129,131.34, 178,200.18 and 72,541.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,131.34 : 178,200.18 = 72,541.50 : x
2. Step 2: Convert to fraction form
   129,131.34/178,200.18 = 72,541.50/x
3. Step 3: Cross multiply
   129,131.34x = 178,200.18 × 72,541.50
4. Step 4: Simplify right side
   129,131.34x = 12,926,908,357.47
5. Step 5: Solve for x
   x = 12,926,908,357.47/129,131.34
6. Step 6: Final answer
   x = 100,106.67