Finding the Fourth Proportional to 139,788.15, 209,602.27 and 64,869.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,788.15 : 209,602.27 = 64,869.76 : x
2. Step 2: Convert to fraction form
   139,788.15/209,602.27 = 64,869.76/x
3. Step 3: Cross multiply
   139,788.15x = 209,602.27 × 64,869.76
4. Step 4: Simplify right side
   139,788.15x = 13,596,848,950.36
5. Step 5: Solve for x
   x = 13,596,848,950.36/139,788.15
6. Step 6: Final answer
   x = 97,267.54