Finding the Fourth Proportional to 118,428.67, 163,429.59 and 64,712.45

Step by Step Solution

1. Step 1: Write the proportion equation
   118,428.67 : 163,429.59 = 64,712.45 : x
2. Step 2: Convert to fraction form
   118,428.67/163,429.59 = 64,712.45/x
3. Step 3: Cross multiply
   118,428.67x = 163,429.59 × 64,712.45
4. Step 4: Simplify right side
   118,428.67x = 10,575,929,822.64
5. Step 5: Solve for x
   x = 10,575,929,822.64/118,428.67
6. Step 6: Final answer
   x = 89,302.11