Finding the Fourth Proportional to 100,885.74, 139,188.99 and 65,099.53

Step by Step Solution

1. Step 1: Write the proportion equation
   100,885.74 : 139,188.99 = 65,099.53 : x
2. Step 2: Convert to fraction form
   100,885.74/139,188.99 = 65,099.53/x
3. Step 3: Cross multiply
   100,885.74x = 139,188.99 × 65,099.53
4. Step 4: Simplify right side
   100,885.74x = 9,061,137,830.17
5. Step 5: Solve for x
   x = 9,061,137,830.17/100,885.74
6. Step 6: Final answer
   x = 89,815.84