Finding the Fourth Proportional to 139,819,852.96, 209,824,888.56 and 85,802,296.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,819,852.96 : 209,824,888.56 = 85,802,296.48 : x
2. Step 2: Convert to fraction form
   139,819,852.96/209,824,888.56 = 85,802,296.48/x
3. Step 3: Cross multiply
   139,819,852.96x = 209,824,888.56 × 85,802,296.48
4. Step 4: Simplify right side
   139,819,852.96x = 18,003,457,297,108,082
5. Step 5: Solve for x
   x = 18,003,457,297,108,082/139,819,852.96
6. Step 6: Final answer
   x = 128,761,809.69