Finding the Fourth Proportional to 118,434.63, 163,439.59 and 64,719.66

Step by Step Solution

1. Step 1: Write the proportion equation
   118,434.63 : 163,439.59 = 64,719.66 : x
2. Step 2: Convert to fraction form
   118,434.63/163,439.59 = 64,719.66/x
3. Step 3: Cross multiply
   118,434.63x = 163,439.59 × 64,719.66
4. Step 4: Simplify right side
   118,434.63x = 10,577,754,695.34
5. Step 5: Solve for x
   x = 10,577,754,695.34/118,434.63
6. Step 6: Final answer
   x = 89,313.02