Finding the Fourth Proportional to 139,630.61, 209,445.91 and 64,740.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139,630.61 : 209,445.91 = 64,740.89 : x
2. Step 2: Convert to fraction form
   139,630.61/209,445.91 = 64,740.89/x
3. Step 3: Cross multiply
   139,630.61x = 209,445.91 × 64,740.89
4. Step 4: Simplify right side
   139,630.61x = 13,559,714,296.56
5. Step 5: Solve for x
   x = 13,559,714,296.56/139,630.61
6. Step 6: Final answer
   x = 97,111.33