Finding the Fourth Proportional to 115,981.47, 160,054.31 and 64,994.60

Step by Step Solution

1. Step 1: Write the proportion equation
   115,981.47 : 160,054.31 = 64,994.60 : x
2. Step 2: Convert to fraction form
   115,981.47/160,054.31 = 64,994.60/x
3. Step 3: Cross multiply
   115,981.47x = 160,054.31 × 64,994.60
4. Step 4: Simplify right side
   115,981.47x = 10,402,665,056.45
5. Step 5: Solve for x
   x = 10,402,665,056.45/115,981.47
6. Step 6: Final answer
   x = 89,692.48