Finding the Fourth Proportional to 133,128.59, 183,710.61 and 72,687.59

Step by Step Solution

1. Step 1: Write the proportion equation
   133,128.59 : 183,710.61 = 72,687.59 : x
2. Step 2: Convert to fraction form
   133,128.59/183,710.61 = 72,687.59/x
3. Step 3: Cross multiply
   133,128.59x = 183,710.61 × 72,687.59
4. Step 4: Simplify right side
   133,128.59x = 13,353,481,498.33
5. Step 5: Solve for x
   x = 13,353,481,498.33/133,128.59
6. Step 6: Final answer
   x = 100,305.14