Finding the Fourth Proportional to 133,085.90, 183,650.78 and 72,644.50

Step by Step Solution

1. Step 1: Write the proportion equation
   133,085.90 : 183,650.78 = 72,644.50 : x
2. Step 2: Convert to fraction form
   133,085.90/183,650.78 = 72,644.50/x
3. Step 3: Cross multiply
   133,085.90x = 183,650.78 × 72,644.50
4. Step 4: Simplify right side
   133,085.90x = 13,341,219,087.71
5. Step 5: Solve for x
   x = 13,341,219,087.71/133,085.90
6. Step 6: Final answer
   x = 100,245.17