Finding the Fourth Proportional to 118,721.76, 163,836.29 and 64,274.50

Step by Step Solution

1. Step 1: Write the proportion equation
   118,721.76 : 163,836.29 = 64,274.50 : x
2. Step 2: Convert to fraction form
   118,721.76/163,836.29 = 64,274.50/x
3. Step 3: Cross multiply
   118,721.76x = 163,836.29 × 64,274.50
4. Step 4: Simplify right side
   118,721.76x = 10,530,495,064.86
5. Step 5: Solve for x
   x = 10,530,495,064.86/118,721.76
6. Step 6: Final answer
   x = 88,698.95