Finding the Fourth Proportional to 99,571.03, 137,315.73 and 72,670.93

Step by Step Solution

1. Step 1: Write the proportion equation
   99,571.03 : 137,315.73 = 72,670.93 : x
2. Step 2: Convert to fraction form
   99,571.03/137,315.73 = 72,670.93/x
3. Step 3: Cross multiply
   99,571.03x = 137,315.73 × 72,670.93
4. Step 4: Simplify right side
   99,571.03x = 9,978,861,802.73
5. Step 5: Solve for x
   x = 9,978,861,802.73/99,571.03
6. Step 6: Final answer
   x = 100,218.53