Finding the Fourth Proportional to 139,578.02, 209,387.82 and 64,705.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,578.02 : 209,387.82 = 64,705.75 : x
2. Step 2: Convert to fraction form
   139,578.02/209,387.82 = 64,705.75/x
3. Step 3: Cross multiply
   139,578.02x = 209,387.82 × 64,705.75
4. Step 4: Simplify right side
   139,578.02x = 13,548,596,466.98
5. Step 5: Solve for x
   x = 13,548,596,466.98/139,578.02
6. Step 6: Final answer
   x = 97,068.27