Finding the Fourth Proportional to 118,419.30, 163,429.72 and 64,712.30

Step by Step Solution

1. Step 1: Write the proportion equation
   118,419.30 : 163,429.72 = 64,712.30 : x
2. Step 2: Convert to fraction form
   118,419.30/163,429.72 = 64,712.30/x
3. Step 3: Cross multiply
   118,419.30x = 163,429.72 × 64,712.30
4. Step 4: Simplify right side
   118,419.30x = 10,575,912,090.63
5. Step 5: Solve for x
   x = 10,575,912,090.63/118,419.30
6. Step 6: Final answer
   x = 89,309.02