Finding the Fourth Proportional to 77,429.64, 116,144.10 and 51,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   77,429.64 : 116,144.10 = 51,128.10 : x
2. Step 2: Convert to fraction form
   77,429.64/116,144.10 = 51,128.10/x
3. Step 3: Cross multiply
   77,429.64x = 116,144.10 × 51,128.10
4. Step 4: Simplify right side
   77,429.64x = 5,938,227,159.21
5. Step 5: Solve for x
   x = 5,938,227,159.21/77,429.64
6. Step 6: Final answer
   x = 76,691.91