Finding the Fourth Proportional to 93,109.60, 139,272.96 and 78,489.50

Step by Step Solution

1. Step 1: Write the proportion equation
   93,109.60 : 139,272.96 = 78,489.50 : x
2. Step 2: Convert to fraction form
   93,109.60/139,272.96 = 78,489.50/x
3. Step 3: Cross multiply
   93,109.60x = 139,272.96 × 78,489.50
4. Step 4: Simplify right side
   93,109.60x = 10,931,464,993.92
5. Step 5: Solve for x
   x = 10,931,464,993.92/93,109.60
6. Step 6: Final answer
   x = 117,404.28