Finding the Fourth Proportional to 102,061.33, 152,804.43 and 77,021.80

Step by Step Solution

1. Step 1: Write the proportion equation
   102,061.33 : 152,804.43 = 77,021.80 : x
2. Step 2: Convert to fraction form
   102,061.33/152,804.43 = 77,021.80/x
3. Step 3: Cross multiply
   102,061.33x = 152,804.43 × 77,021.80
4. Step 4: Simplify right side
   102,061.33x = 11,769,272,246.57
5. Step 5: Solve for x
   x = 11,769,272,246.57/102,061.33
6. Step 6: Final answer
   x = 115,315.69