Finding the Fourth Proportional to 35,109.84, 52,685.57 and 12,938.78

Step by Step Solution

1. Step 1: Write the proportion equation
   35,109.84 : 52,685.57 = 12,938.78 : x
2. Step 2: Convert to fraction form
   35,109.84/52,685.57 = 12,938.78/x
3. Step 3: Cross multiply
   35,109.84x = 52,685.57 × 12,938.78
4. Step 4: Simplify right side
   35,109.84x = 681,686,999.40
5. Step 5: Solve for x
   x = 681,686,999.40/35,109.84
6. Step 6: Final answer
   x = 19,415.84