Finding the Fourth Proportional to 139,598.76, 209,421.66 and 64,688.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,598.76 : 209,421.66 = 64,688.52 : x
2. Step 2: Convert to fraction form
   139,598.76/209,421.66 = 64,688.52/x
3. Step 3: Cross multiply
   139,598.76x = 209,421.66 × 64,688.52
4. Step 4: Simplify right side
   139,598.76x = 13,547,177,241.34
5. Step 5: Solve for x
   x = 13,547,177,241.34/139,598.76
6. Step 6: Final answer
   x = 97,043.68